Waterproofing compound for cement and concrete



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UNITED STATES EMU! PATENT OFFICE ALBERT RUSSELL CAMPBELL, 0F GOVINGTON,KENTUCKY, ASSIGNOR OF FOR'IY-NINE PER CENT '10 DAVID RUBIN, 0FCINCINNATI, OHIO WATERPROOFING COMPOUND FOR CEMENT AND CONCRETE 1T0Drawing.

The invention disclosed herein makes it possible to utilize to advantageby-products that have heretofore been considered. waste products and atthe same time provide a new variation or exact compositionof the indicated sand is not, however material. In the process of moldin portions ofthe mold or sand are subjecte to extremely high temperatures, variousgases are either formed or thrown ofi and these gases in some manneraffect the sand of the mold, and various fine,

parts of the iron and steel become separated from the casting and minglewith the sand of the mold. The sand when taken from the mold is usedrepeatedly until it reaches a condition such that it can no longer beused for molding. At or about that time the sand may be properlyreferred to as g ugmnd. This sand is used in preparing t e compositionof the invention.

The castin s taken from the sand are generally ground to some extent ona carborundum wheel with the result that some of the carborundum andsome of the iron becomes a by-product, or waste product. It has been thepractice around foundries and the like to take this arborundum and theand to throw 1 e which was considered of no further value.

The invention herein consists in the taking of the aforesaid brunt sand,iron and carborundum, and amixin therwi I n tit of salt. The resconcrete, cement, et cetera, to such low water absorption propertiesthat the indicated structure may be said to be substantially wa-Application filed November 17, 1927. Serial No. 234,041.

'gerpdroof. it Illias also been found that the ar ness 0 t e structureis materia in-- alysis of the compound shows substantially the followingcomposition p Per cent Ground iron 8 Carborundum 2% Sa1t 1 Burnt sand88% Analyses of various sands used in making batches of waterproofingcompound, and all of which batches proved satisfactory and efficient,were as follows:

Burnt Carbo- Iron silica rundum Per cent Per cent Per cent Batch 1 2. 5295. 43 2. 00 Batch 2 1. 90 '98. 0O 03 To the foregoin batches there wasadded approximately s cient salt to make the salt content of theresultant composition approximately 1% thereof.

A second mixture of the following proportions was made, tested and foundto give the indicated results:

To 100 pounds of the foregoing composition there was added 100 pounds ofcleansharp sand and sufiicient water to mix same. The resultant productattained the indicated results. The foregoing composition can be used asa cement surfacing for substantially waterproofing the understructureupon which the surfacing is applied. If desired the waterproofingcompound may be admixed witha concrete mass or the like, therebyrendering such concrete mass substantially free of water absorption andalso to give greater hardness to the mass.

In instances where the composition was added to plaster, brick mortarand tile mortar, analogous results were obtained. Although there wouldnaturally be some variation in the composition of mortars, cement,concrete masses and the like, substantially uniform results are obtainedin each instance dependent upon the quantity of the waterproofingcompound used in the mixture. If approximately a quantity ofwaterproofing equivalent to the quantity of cement is employed in agiven batch, a very efi'ective waterproofing is attained. If thequantity of waterproofing substance is decreased, of course the degreeof possible water absorption becomes greater.

What is claimed is:

1. A waterproofing compound comprising substantially burnt silica, 2%iron, 2% carborundum and 1% salt.

2. The combination with a hydraulic cementitious material of a compoundcomprising substantially 95% burnt silica, 2% iron, 2% carborundum and1% salt.

In testimony whereof, I have hereunto subscgii ped my name this 14th dayof November, 1

ALBERT RUSSELL CAMPBELL.

